Help with prefix and postfix(increment&decrement)

I know that when used alone both prefix postfix work the same way but in expressions it behaves differently when combined.:confused:

Code Java:

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int a=1,b=3,c=4,d=0;
d=a-(b++)*(c++)

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please explain its working

The results of a postfix operation are the original value, where the prefix results are that of the new value.

Code Java:

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int a = 3;
int b = a++; // increment a after setting b=a
int c = ++a; // increment a then set c=a

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